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Report Number: 32979 QC Report: Matrix Spike/Matrix Spike Duplicate Date : 05/13/2003 Project Name : 7-Eleven Store #32262 Project Number: 77EL.32262.43 Duplicate Spiked Duplicate Spiked Spiked Sample Relative Spike Spiked Spiked Sample Sample Relative Percent Percent Spiked Sample Spike Dup. Sample Sample Analysis Date Percent Percent Percent Recov. Diff. Parameter Sample Value Level Level Value Value Units Method Analyzed Recov. Recov. Diff. Limit Limit Benzene 32993-01 <0.0050 0.0408 0.0408 0.0384 0.0388 mg/Kg EPA 82608 5/6/03 94.0 95.2 1.24 70-130 25 Toluene 32993-01 <0.0050 0.0408 0.0408 0.0377 0.0377 mg/Kg EPA 8260B 5/6/03 92.4 92.5 0.0270 70-130 25 Tert-Butanol 32993-01 <0.0050 0.204 0.204 0.188 0.183 mg/Kg EPA 8260B 5/6/03 92.3 89.6 2.91 70-130 25 Methyl-t-Butyl Ether 32993-01 <0.0050 0.0408 0.0408 0.0396 0.0394 mg/Kg EPA 82608 5/6/03 97.0 96.6 0.361 70-130 25 Benzene 33009-15 <0.50 40.0 40.0 40.1 37.4 ug/L EPA 82608 5/7/03 100 93.6 6.84 70-130 25 Toluene 33009-15 <0.50 40.0 40.0 40.0 37.4 ug/L EPA 8260B 5/7/03 100 93.6 6.71 70-130 25 Tert-Butanol 33009-15 <5.0 200 200 211 202 ug/L EPA 8260B 5/7/03 106 101 4.39 70-130 25 Methyl-t-Butyl Ether 33009-15 <0.50 40.0 40.0 46.2 44.5 ug/L EPA 8260B 5/7/03 115 111 3.75 70-130 25 Benzene 33050-01 3.8 40.0 40.0 42.0 41.7 ug/L EPA 8260B 5/12/03 95.5 94.8 0.788 70-130 25 Toluene 33050-01 <0.50 40.0 40.0 38.0 38.0 ug/L EPA 82608 5/12/03 95.0 95.0 0.0263 70-130 25 Tert-Butanol 33050-01 85 200 200 288 279 ug/L EPA 8260B 5/12/03 102 97.1 4.48 70-130 25 Methyl-t-Butyl Ether 33050-01 390 40.0 40.0 440 431 ug/L EPA 82608 5/12/03 131 108 19.4 70-130 25 Approved By: J I Kiff KIFF ANALYTICAL, LLC 2795 2nd St, Suite 300 Davis, CA 95616 530-297-4800